helen.liu
Newbie level 6
lna de-sensitivity
Hi all,
i want to know how to judge whether the LNA is self excitated?
I design the CDMA mobile phone, the sensitivity is very low in some channel, only -100dBm, and some channel is normal, about -108dBm, this is in B2, before B2 the sensitivity is very good, and there is no change from B1 to B2, except add the ground vias around the Receiver chipset. (LNA is integrated in the receiver chip)
I think this maybe caused by LNA self excitated, but I don't know how to judge? and what will cause the LNA self excitated?
I think the receiver debug is very difficult, because the signal is very small, anyone please give me some advice to debug the receiver?
now, the phone is in production. and the senstivity of few phones also have problem, then I don't know how to find the problem, and I have no idea about this.
Hi all,
i want to know how to judge whether the LNA is self excitated?
I design the CDMA mobile phone, the sensitivity is very low in some channel, only -100dBm, and some channel is normal, about -108dBm, this is in B2, before B2 the sensitivity is very good, and there is no change from B1 to B2, except add the ground vias around the Receiver chipset. (LNA is integrated in the receiver chip)
I think this maybe caused by LNA self excitated, but I don't know how to judge? and what will cause the LNA self excitated?
I think the receiver debug is very difficult, because the signal is very small, anyone please give me some advice to debug the receiver?
now, the phone is in production. and the senstivity of few phones also have problem, then I don't know how to find the problem, and I have no idea about this.